Stabilizing effect of ionized background of trans-Alfvenic expansion of exploding plasmas

Conference · Sun Dec 31 04:00:00 EST 1995

OSTI ID:178201

Zakharov, Yu P; Ponomarenko, A G ^[1]; Dudnikova, G I; Vshivkov, V A ^[2]

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1. Inst. of Laser Physics, Novosibirsk (Russian Federation)
2. Inst. of Computational Technologies, Novosibirsk (Russian Federation)

Recently a lot of theoretical and numerical calculations have been performed devoted to the study of Large-Larmor-Flute Instability (LLFI). Such instability was discovered initially in laboratory and later in active experiments (AMPTE, CRRES) on expansion of a quasispherical plasma cloud in a ``vacuum`` magnetic field {rvec B}{sub 0}. In the laser-produced plasma experiments at KI-1 facility it was established for the first time, that such non-MHD instability and LHD-instability of skin-layer may effectively be suppressed by ionized background at high-Alfven Mach numbers M{sub A} {much_gt} 1 as well as in a transient regime M{sub A} {approximately} 1. In the present paper on the basis of laboratory and computer simulation the value of M{sub A} was defined more exactly and other similarity parameters characterizing the development of LLFI was founded. The laser experiments were realized in hydrogen and argon background plasmas. The computer simulations were carried out with 2D electromagnetic hybrid code. It was exposed the transition from flute increase to decrease one when M{sub A} changed from M{sub A} = 1 to M{sub A} = 3.

• OSTI ID: 178201
• Report Number(s): CONF-950612--; ISBN 0-7803-2669-5
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ALFVEN WAVES
FLUTE INSTABILITY
IONOSPHERE
LASER-PRODUCED PLASMA
PLASMA EXPANSION
SATELLITES
SIMULATION
STABILIZATION